Phase regulation of Cs4PbBr6/CsPbBr3 in tellurate germanate glasses induced by P2O5

All inorganic perovskite quantum dots (QDs) have broad applications due to its unique photoelectric properties. At present, a large number of QDs embed glasses of three-dimensional (3-D) CsPbBr3 cubic phase or zero dimensional (0-D) Cs4PbBr6 hexagonal phase have been reported, but the phase regulation between 0-D and 3-D has not been deeply studied only by the adjustment of the glass network topology. In this paper, Cs4PbBr6/ CsPbBr3 QDs were successfully synthesized in tellurite germanate glass by high-temperature melt-quenching combined with in-situ crystallization, and their luminescence properties, structures, and phase regulation fun-damentals in glasses were investigated in depth. The introduction of P2O5 increases the ratio of [TeO4]/[TeO3] units in the tellurite germanate glasses, resulting in a more compact glass network and changing the growth environment of QDs. When the content of the nucleating agent P2O5 was increased to 3% (mass fraction), the crystalline phase of QDs realized the regulate from 0-D hexagonal phase to 3-D cubic phase. The regulation from Cs4PbBr6 to CsPbBr3 is accompanied by a blue-shifted emission peak from 519 to 482 nm, and the synthesized QDs glasses all have good long-term stability. The QDs glasses obtained in the experiment has great potential in the application of white light emitting diodes.

Automated summary

All inorganic perovskite quantum dots (QDs) were successfully synthesized in tellurite germanate glass by high-temperature melt-quenching combined with in-situ crystallization. The introduction of P2O5 in the glass network increased the [TeO4]/[TeO3] units ratio, resulting in a more compact glass network and changing the growth environment of QDs. The regulation from Cs4PbBr6 to CsPbBr3 was achieved by increasing the content of nucleating agent P2O5, accompanied by a blue-shifted emission peak and good long-term stability. The synthesized QDs glasses show great potential in the application of white light emitting diodes.